Expansion joint for concrete roads



Patented dan- 7, 1930 UNITED STATES.

PATENT OFFICE ALBERT G. FISCHER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE PHILIP CAREY IAN'U- FACTURING COMEANY, A CORPORATION'OF OHIO EXPANSION JOINT .FOR CONCRETE ROADS No Drawing.

As heretofore practised, when mixing fibrous material with asphalt the. fibrous material has always been penetrated by the asphalt, with the result that the toughness and resiliency of the fibrous material is destroyed. According to my present invention the fibrous material used has been selected so as to overcomethe likelihood of the same tearing out of the asphalt due to lack of a relatively wide surface area which would not ordinarily give it a good hold on the asphalt.

My invention relates to a flat, ribbon-like fibrous matter whichis known on the market as coarse excelsior. These ex'celsior ribbons are very nearly a quarter of an inch in width and vary in thickness from that of light paper to that of a very heavy paper. .This fibrous ribbon does not necessarily have to consist of excelsior, however, but may be shredded paper in ribbon formation.

the asphalt and makes for strength and compressibility-strength by reason of its wider not make it as compact a mass as where the fibrous matter is in string-like formation.

The material to be mixed with this fibrous matter is a rubberized asphalt, which is an asphalt in which a relatively small percentage, say five to ten per cent of. rubber latex or dissolved rubber is mixed therewith, and which gives great elasticity to the binding material. Alternatively a blown asphalt is preferred to ordinary asphalts that are not blown.

Likewise, with this ribbon fibrous matter may be included other fibrous matter as a filler, but in order to secure the greatest strength and resiliency, between and 50 per cent of the mixture should be of ribbon formation, although better results are obtained if the entire percentage is of ribbon formation. It is preferable that the fibrous matter reformed strip of rubberized bituminous mate- The flat structure obtains a better hold on strip embodyin Application filed July 30, I925. Serial No. 47,176.

formation between the inter-weavings, which makes the expansion joint highly resilient.

I claim: 1. An expansion joint comprising a prerial "havin fibrous material incorporated therein in the form of ribbo -like strands.

2. An expansion joint comprising a preformed strip of rubberized asphalt having fibrous material incorporated therein in the form of ribbon-like strands of approximately 4 of an inch in width.

3. Expansion joint comprising a preformed strip, saidstrip embodying in its construction elastic binding material consisting of a homogeneous mixture of asphalt and rubber and having fibrous material incorporated therein in the form of ribbon-like strands of approximately 1; of an inch in width.

4. Expansion oint comprising a preformed strip of rubberized bituminous composition ha'vingunpenetrated fibrous material incorporated therein in the form of ribbon-like surface hold and compressibility because of its inter-weaving and inter-lacing, which does strands.

5. Expansion joint comprising a preformed in its construction a rubberized plastic inding material having unpenetrated fibrous material incorporated therein in the form of ribbon like strands.

In testimony whereof I have signed my name to this specification on this 10th day of March, 1925.

ALBERT G. FISCHER.

main as largely as possible in an unpenetrated state; namely, that it be merely coated and imbedded in the asphaltic mixture. This process particularly is favorable to cellular 

